ОПРЕДЕЛЕНИЕ СТАТИСТИЧЕСКИХ ХАРАКТЕРИСТИК ЭЛЕКТРИЧЕСКОЙ ПРОЧНОСТИ ТРАНСФОРМАТОРНОГО МАСЛА С УЧЕТОМ ЕГО ОБЪЕМА В ТРАНСФОРМАТОРАХ

Background: Nowadays the basic insulation of transformer is chosen without taking into account the influence of transformer oil volume. In order to take this factor into account the authors have to study statistical performances of oil electrical strength and develop the methodology for their evaluation. Materials and methods: The authors used the statistical model of transformer oil fault. The research about the influence of oil volume on statistical performances of strength was carried out with the usage of the Gnedenko - Weibull threeparameter distribution, which indicates physical processes in oil breakdown. Results: The authors suggest the evaluation method of statistical performances of transformer oil electrical strength. This method takes into consideration the influence of oil volume and quality on their variation. The comparison of experimental data and calculation results is carried out. Conclusions: The authors prove that the suggested method allows to determine characteristics of electrical oil strength, including the lower point of fault tension and may be used for choosing the basic insulation of transformer taking into account the evaluation of transformer oil volume influence on it.